Cut-off valve mechanism.



N0. 697,839. Patented Apr. {5,1902.

J. HAUG. CUT-oFF vALvE MEcHAnlsMl (Application led Jan. 20 1902A.)

(No Model.)

Sterns @its JOHN HAUG, OF PHILADELPHIA, PENNSYLVANIA.

CUT-OFF VALVE MECHANISIVI.

SPECIFICATION forming par., Of Letters Patent No. 697,839, dated April 15, 1902. Application filed January 20,1902. Serial No. 90,501. (No model.)

To @ZZ whom, zt may concern.:

Be it known thatI, JOHN HAUG, a citizen ot the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Cut-Ott Valve Mechanism for Steam-Engines, of which the following is a specification.

My invention consists of certain improvements in that class of steam-engine cut-ott' valves in which the cut-ott' valve is located inside of the main valve and is composed of two parts movable longitudinally toward and from each other by reason of their engagement with aright and left hand screw, a valve of this class being shown in the patent of WV. Brown, No. 359,707, dated March 22, 1887. In prior valves of this class the cut-oit-valveoperating stem has been located outside of the valve-chest and has been connected to the cut-oif-valve adjusting-screw outside of the rear head of the valve-chest, the consequence being that said stem was extremely long and necessitated a long arm for connecting the same with the adjusting-screw, the indirect connection and the leverage due to the use of the longconneeting-arm beingobjectionable features of this class oi valve mechanism.

In carrying out my invention, therefore, I provide i'or the use of a shorter cut-oit-valveoperating stem and a shorter connecting-arm between the same andthe adjusting-screw, and I operate the latter more directly, and consequently more ettectively,than is possible with the old construction.

In the accompanying drawings, Figure 1 is a longitudinal section of part of a steam-engine cylinder and valve-chest with cut-oit valve constructed in accordance with my invention; and Fig. 2 isa transverse section on the line a a, Fig. 1.

The valve-chest casing is represented at 1, the combined induction and eduetion ports at 2, and the exhaust-port at 3. Each of the induction and eduction ports is provided within the valve-chest with an annular sleeve Ai, these sleeves serving as guides for the opposite heads of the main valve 5 and having ports G, which are by the movement of said valve 5 alternately opened to the ends of the valve-chest, in which live steam under pressure is constantly maintained, or to the exhaust-port 3, so as to provide for the alternate admission of steam to and its exhaust from each end of the cylinder.

The duplex cut-ott valve comprises two rings 7, one operating in conjunction with the ports 9 of one head of the valve and the other operating in conjunction with the ports 9 ot' the other head of the valve, said rings having hubs 10, that of one ring having a nut engaging with the right-hand thread 11 and that of the other ring having a nut engaging with the left-hand thread 12 of the adjusting-screw 13, which passes through a stuffing-box in the back head ot the valve-chest in the usual manner and is intended to be connected with mechanism whereby it can be turned while being reciprocated, so as to cause the cut-oitvalve rings 7' to be moved toward or from each other in order to vary the character of the cut-off. Thse parts are all similar to the ordinary valves of this construction; but instead ot' reciprocating the adj usting-screw 13 by connection with an outside rod, as usual, I connect said screw to a stem 1li, located inside of the main valve and passing through a stuliiug-box in the front head of the valvechest and also through a suitable opening in the yoke l5, whereby the main valve is connected to its operating-rod 16. The stern 14: also passes through openings in the eut-oftvalve rings 7 and is connected to the screw 13 by means of a short arm, comprising opposite clamp-plates 17, which are securely confined to the stem 14 by means of transverse bolts 19, these clamp-plates embracing the screw 13 at a point between the hubs of the two valve-rings 7 and'being confined 1ongitudinally between collars 2O on said screw, as shown in Fig. 1, so that any longitudinal movement imparted to the stem 14 is transmitted to said screw 13, while at the same time free turning movement of said screw is permitted. By this means a more direct connection of the` cut-ott valves with their operating devices is effected than by the usual construction. Power is applied to the cutod valves in order to reciprocate the same at a point close to and equidistant from each cut-ottfvalve ring instead of at a point remote therefrom, Vand the length of the arm con- I OO necting the cut-off-valve stem and the adjusting-screw is reduced to a minimum, the strain upon said arm and the objections arising therefrom being practically eliminated.

Having thus described my invention, I

claim and desire to secure by Letters Patentl. The combination of the tubular main valve, the duplex internal cut-O valve and the screw for adjusting the same, with the cut-off-valve stem located on the inside of the main valve, substantially as specified.

2. The combination of the tubular main valve, the duplex internal cut-off Valve and the adjusting-screw therefor, with the cutoff-valve stem located on the inside of the main valve and having connection with the adjusting-screw of the cut-off valve at a point In testimony whereof I have signed my 3o name to this specification in the presence of tWo subscribing Witnesses.

JOHN HAUG.

Witnesses: F. E. BEcHroLD, J Os. I-I. KLEIN. 

